Cementing head



May 17, 1927.

H. A. DAVIS ET AL CEMENTING HEAD Filed April 22, 1924 7///l//J/////4 17/v i 2 I CLEO FD v/s Patented May 17, 1927.

" UNITED STATES 1,629,022 PATENT OFFICE.

HERBERT A. DAVIS AND CLEO 'F. DAVIS, OF TORRANGE, CALIFORNIA.

cnunm'rne HEAD.

Our invention relates to cementing heads used 1n cementing off 011wells, and a purpose of our invention is the provision of a cementinghead of simple and durable con-- struction, having locking means bywhich We will describe only one form of ce-.

I menting head embodying our invention, and

will then point out the novel features there of in claims.

In the accompanying drawings Figure 1 is a view showing in sideelevation, and partly in section, one form of cementin head embodyingour invention in applied; position with. respect to a well casing;

Figure 2 is a view similar to Figure 1, but taken at right angles to thelatter;

Figure 3 is a transverse sectional view taken on the line 3-3 of Figure1.

Referring specifically to the drawings, in

which similar reference characters refer to similar partsin all the,views, our inventionin its present embodiment comprises a cementinghead including a body 15 provided at its upper side with a transverseprojection 16 formed with a longitudinally extending passageway 18 whichcommunicates with a chamber 19 formed in the projection and body and theapex at a frusto-conical chamber 20 formed in the body 15. The

under side of the body 15 is rovided with an annular groove 21 of suchiameter as to receive a conventional couplin collar 22 of a well casingsection 23, an within the groove 21 is a compressible gasket 24 formedof rubber or other suitable material and provided for the purpose offorming a fluidtight joint between the headbody and the coupling collar.

The passageway 18 is adapted to have communication with pipes 25 and 26,the pipe 25 being connected to a source of liquid cement supply, and thepipe 26 connected to a source of water supply, whereby either cement orwater can be delivered to the well casing through the chambers 19 and20.

At diametrically opposed points upon the periphery of the body 15enlargements 27 are formed and provided with vertical slots 28, throughwhich extend rods 29 for snap Application filed April22, 1924. SerialNo. 708,129,

porting lockin members 30 in depending relation to the ody 15 and forengagement with the lower edge of the collar 22 to secure the head as aunit upon the well casing. The lower ends of the rods '29 are formedwith heads. 31 which serve to confine the members 30 upon the rods andto permit movement of the members by manipulating the rods throughhandles 32 formed on the upper ends of the rods. These members 30 are,in the present instance, of substantially semi-circular form,- and theyco-operate to provide a locking ring adapted to embrace the casingsection 23 at a point below the colbars 33 outwardly the projections 36will I,

disengage the keeper lugs 35 to permit separation of the members 30..

For the purpose of forcing the head 15 downwardly upon the connectingcollar so as to compress the'gasket 24, the rods 29 are formed withslots 29 through which extend wedge keys 37 each having-one'of its endsbeveled, as indicated at 38, while its oppo site end is formed withaprojection 39 to limit the movement of the plates in one directionthrough the slots 29. I

It is to 'be particularly noted that the slots 28. gradually increase inwidth from their upper ends to their lower ends for the purpose ofallowing lateral movement of the rods within the head to permit of acorresponding movement of the locking members 30 so that they can beshifted from the locking position shown in solid lines in Figure 1 tothereleased position shown in dash lines.

In practice, the head 15 is arranged upon the connecting collar 22 inthe manner shown in Figure 1, and with the locking members 30 in thedash line position, it will be clear that they can be moved inwardly toengage the lower edge of the connecting collar. As they are moved tothis position the projections 36 of the latch bars 33 engage the keeperlugs 35 to retain the two locking members in ring formation. By drivingthe wedge keys 37 through the slots 2% or the rods 29, it will be clearthat because of their wedge formation they will tend to draw the rods 29upwardly, but because of the tact that the locking members 30 are now inengagement with the stationary collar 22 it will be clear that thistendency is converted into downward movement of the head 15 upon thecollar, thereby compressing the gasket 24c and providing a fluid-tight.connection between the body and collar. As the locking members 30aremaintained in engagement with the lower edge of the collar 22 it will beclear that the bodyvlo will be maintained in tightly seated positionupon the collar and locked against upward.

movement irrespective of the internal pressure within the well casing.

lln order that a measuring cable can be extended through the body 15 fordetermining the depth to which a cement plug is lowered into the wellcasing, we have provided the transverse projection 16 with a verticalopening communicating with the chamber 19 and having'a stug boxllremovably fitted therein to prevent leakage past the cable when thelatter is in the opening. Although we have herein shown and describedonly one form of cementing head embodying our invention, it is to beunderstood that various changes and modifications may be made hereinwithout departing from the spirit of the invention and the spirit andscope of the appended claims.

What we claim is:

1. A. cementing head comprising a body adapted to be supported on acoupling collar and having a groove therein for receiving the upper ed eof the collar, a compressible member wit in said groove, and meansadapted to engage said collar for securing neaaoaa the body to thecollar and for compressin said compressible member to provide a fiuitight joint between the body and collar.

2. 'A cementing head com rising a body having an annular groove t ereinadapted to receive a coupling collar, a compressible gasket within saidgroove, locking members carried by the body and adapted to embrace awell casing at a point below the collar so as to abut the latter, andmeans co-operating with the body for forcing the body in the directionof the locking members whereby a fluid tight joint is provided betweenthe body and collar.

3. A cementing head comprising a body having an annular groove adaptedto receive a coupling collar and being formed with openings throughwhich fluids are adapted to be introduced to a well casing, acompressible gasket disposed within the groove between the body andcollar, co-operative locking members adapted'to embrace a well casing ata point below and abutting the collar, and elements mounted in the bodyand connected to the members to permit vertical movements of the membersto draw the body toward the collar, -thus compressing the gasket, and toallow outward movement of the members to disengage the collar.

4. A cementing head comprising a body having tapered openings therein,semi-circular locking members, rods loosely fitted in the openings andsecured to the locking members to allow vertical and swinging movementsof the members, the body, looking members and rods being at all times inassembled relation, means forlatching the members together, and meansengaging the body and rods for forcing the body downwardly on the rodswhen the body is in applied position upon a well casing.

HERBERT A. DAVIS. CLEO 1E. DAVIS.

